Hello Nemis, welcome to myBulova. This is a second generation Accutron (218) from Bulova. The first generation (214) did not have a winding stem, this gen has it at the four o'clock position, which makes it instantly recognizable as an Accutron. Accutron was incredibly popular throughout the 1960's and early 70's as they were so different than any watches that came before them.

Some Accutron watches had model names , some just had model number designations. We will name this watch Accutron Calendar. Thanks for sharing it, it's very nice.